In cold weather the fuel will freeze up.. usually when cheaper fuels are used the ethanol aditive(corngas) has a byproduct called water..this will freeze in low spots in the fuel system.. each car need 3 things to run.. fire (spark) fuel and air..if one of these 3 arent present it will not run..

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Saturn Ion's have a problem with the starter switch in the steering column. The security feature built into the key is a small resistor. When the key is inserted, the engine computer 'reads' the resistance and accepts the key as valid. The problem is that the pin that the key contacts is gummed up INSIDE the ignition switch. A new switch will fix the problem but Saturn won't cover the replacement though they have issued a tech bulltein on the problem.

The other fix that I did based on an Internet search is to cut the small 24 ga white wire coming from the ignition switch WHILE THE CAR IS RUNNING. The engine computer defaults to the run mode and will no longer look for the key verification. The small key symbol remains lit on the dash but the car starts everytime. Small price to pay. The real answer is that Saturn should replace or discount the repair due to HEAVY grease in the switch the gums up over time. Under 40 degrees, the connection is lost to the computer.

Either the fuel filter or pump has gone bad. If the car sat for awhile, there is sediment and grime and grit in a gas tank that will settle to the bottom. My guess is when you started it you got some of that debris in the filter. Either that or someone put sugar in your gas tank. Or cut your gas line. That stuff happens sometimes unfortunately. Hope it helps and good luck.

I'd go for a free code scan first at one of the major auto parts stores, then you have an idea at least where to concentrate your efforts. Saves money in the long run, and if you prefer, write them down, and get back to us for some help.

I had a similar problem. My truck would start fine until it sat after running a while and I shut it off for ten minutes or so.The engine heat heat would rise to the deisel fuel injection pump and the truck would whirl over when I tried to start it, but it would not fire. There is a spring in the fuel shutoff on the injection pump that expands with heat and, as it gets older, sticks so that the solenoid doesn't open. I found that a small amount of cool water poured on the pump would cool it enough to start.

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Turn on the key and listen by the fuel tank for the fuel pump to hum. A common problem is low fuel pressure. It will build pressure when the key is turned, use that fuel, and then the pressure drops. Kind of like when you're using a squirt gun that's getting empty.